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/* Copyright (c) 1986 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* |
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* source.h - header file for ray tracing sources. |
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* |
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* 8/20/85 |
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*/ |
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#define AIMREQT 100 /* required aim success/failure */ |
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#define SDISTANT 01 /* source distant flag */ |
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#define SSKIP 02 /* source skip flag */ |
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#define SPROX 04 /* source proximity flag */ |
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#define SSPOT 010 /* source spotlight flag */ |
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#define SVIRTUAL 020 /* source virtual flag */ |
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#define SFLAT 040 /* source flat flag */ |
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#define SFOLLOW 0100 /* source follow path flag */ |
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typedef struct { |
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FVECT aim; /* aim direction or center */ |
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float siz; /* output solid angle or area */ |
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float flen; /* focal length */ |
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} SPOT; /* spotlight */ |
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typedef struct { |
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int sflags; /* source flags */ |
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FVECT sloc; /* direction or position of source */ |
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FVECT snorm; /* surface normal of flat source */ |
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float ss; /* tangent or disk radius */ |
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float ss2; /* domega or projected area */ |
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struct { |
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float prox; /* proximity */ |
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SPOT *s; /* spot */ |
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} sl; /* localized source information */ |
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union { |
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int success; /* successes - AIMREQT*failures */ |
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int svnext; /* next source to aim for */ |
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} sa; /* source aiming information */ |
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long ntests, nhits; /* shadow tests and hits */ |
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OBJREC *so; /* source destination object */ |
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} SRCREC; /* light source */ |
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/* |
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* Special support functions for sources |
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*/ |
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/* |
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* Virtual source materials must define the following. |
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* |
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* vproj(pm, op, sp, i) Compute i'th virtual projection |
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* of source sp in object op and assign |
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* the 4x4 transformation matrix pm. |
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* Return 1 on success, 0 if no i'th projection. |
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* |
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* nproj The number of projections. The value of |
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* i passed to vproj runs from 0 to nproj-1. |
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*/ |
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typedef struct { |
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int (*vproj)(); /* project virtual sources */ |
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int nproj; /* number of possible projections */ |
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} VSMATERIAL; /* virtual source material functions */ |
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typedef struct { |
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int (*setsrc)(); /* set light source for object */ |
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double (*getpleq)(); /* plane equation for surface */ |
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double (*getdisk)(); /* maximum disk for surface */ |
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} SOBJECT; /* source object functions */ |
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typedef union { |
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VSMATERIAL *mf; /* material functions */ |
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SOBJECT *of; /* object functions */ |
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} SRCFUNC; /* source functions */ |
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extern SRCFUNC sfun[]; /* source dispatch table */ |
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extern SRCREC *source; /* our source list */ |
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extern int nsources; /* the number of sources */ |
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extern double srcray(); /* ray to source */ |
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extern int srcvalue(); /* compute source value w/o shadows */ |
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extern double intercircle(); /* intersect two circles */ |
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extern double spotdisk(); /* intersecting disk for spot */ |
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extern double beamdisk(); /* intersecting disk for beam */ |
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extern SPOT *makespot(); /* make spotlight */ |
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extern double dstrsrc; /* source distribution amount */ |
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extern double shadthresh; /* relative shadow threshold */ |
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extern double shadcert; /* shadow testing certainty */ |
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extern int directrelay; /* maximum number of source relays */ |
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extern int vspretest; /* virtual source pretest density */ |
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#define getplaneq(c,o) (*sfun[(o)->otype].of->getpleq)(c,o) |
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#define getmaxdisk(c,o) (*sfun[(o)->otype].of->getdisk)(c,o) |
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#define setsource(s,o) (*sfun[(o)->otype].of->setsrc)(s,o) |
